While Arab-Nomadic culture lacked a grand imperial art, their aesthetic tastes contributed essential elements to Islamic art. Nomads treasured the minor arts of textiles and weapons, and lavished them with geometrical decoration. Life under the stars, in the infinitude of the desert, endowed them with a love of surfaces filled with radient, boundless patterns, and lush visions of paradise and vines. Along with architecture, decoration is a core element in Islamic art. http://www.dartmouth.edu/~matc/math5.pattern/lesson5art.html